Political Correctness Toward Islam

After each terrorist attack, politicians in the West suddenly turn to theologians; they start defending Islam rather than dealing with terrorism itself.
How do politicians like Obama, Francois Holland, or David Cameron know that Islam is a religion of peace? I wonder how much time they spent reading the Quran and trying to understand it? Did they read the biography of Muhammed for example? I can assure you none of them did, but still they give statements about Islam.